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국내 무연탄용 순환유동층 Boiler의 Clinker생성에 관한 연구
전문택,김진호,김경남 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1
The analysis of anthracite coal as fired basis and clinkers located on combustor, seal pot and cyclone to find out the reason why the bed materials agglomerated and resulted in clinkers were studied. It was one of the most serious problem in early period operating the Tonghae CFBC(Circulating Fluidized Bed Combustor). The proximate analysis, heat value analysis, ash fusion temperature analysis and size distribution analysis of coal & ash were studied using TGA, Bomb Calorimeter, Ash Fusibility Determination and Sieve Shaker. The chemical compositions and microstructure of raw material and clinker located on combustor, seal pot and cyclone were investigated by the scanning electron microscope(SEM) with an energy dispersive X-ray spectrometer(EDS), ICP-AES, X-ray diffractometer(XRD). The domestic anthracite coal had much fine size portion which could cause after burning. Furthermore domestic coal had higher ignition temperature and lower volatile matter portion than bituminous coal, which finally ended in low combustion velocity. So it is fundamental to lengthen the furnace residence time to reach complete combustion. And it is possible to use auxiliary fuel but its dependence is low for CFBS because combustion temperature is at around 800~850℃, which range is very lower than general fine size coal combustion type. Fine size coal could do after burning, so it could cause temperature rising at combustor upper region and clinker formation by means of fouling. The short residence time of fine size coal in furnace can bring out high content of unburned carbon in fly ash, so it is necessary to reduce the fine size coal content. Assembling the result of chemical composition analysis, crystal structure analysis and EDS analysis of clinker, we could conclude that calcium in limestone and iron in bed material did the main effect in agglomeration.
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